package com.easy.common.util;

import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

public class Security {
	
  private static final String[] hexDigits = { 
    "0", "1", "2", "3", "4", "5", "6", "7", "8", "9", "a", "b", "c", "d", 
    "e", "f" };

  public static String byteArrayToHexString(byte[] b) {
    StringBuffer resultSb = new StringBuffer();
    for (int i = 0; i < b.length; ++i) {
      resultSb.append(byteToHexString(b[i]));
    }
    return resultSb.toString();
  }

  private static String byteToHexString(byte b) {
    int n = b;
    if (n < 0) {
      n += 256;
    }
    int d1 = n / 16;
    int d2 = n % 16;
    return hexDigits[d1] + hexDigits[d2];
  }

  public static byte[] hexStringToByteArray(String s) {
    byte[] b = new byte[s.length() / 2];
    for (int i = 0; i < b.length; ++i) {
      int index = i * 2;
      int v = Integer.parseInt(s.substring(index, index + 2), 16);
      b[i] = (byte)v;
    }
    return b;
  }

  public static String MD5(String origin) {
    String resultString = null;
    try {
      resultString = new String(origin);
      MessageDigest md = MessageDigest.getInstance("MD5");
      resultString = byteArrayToHexString(md.digest(resultString.getBytes()));
    } catch (Exception localException) {}
    return resultString;
  }

  public static String SHA1(String origin) {
    String resultString = null;
    try {
      MessageDigest md = MessageDigest.getInstance("SHA-1");
      md.update(origin.getBytes());
      resultString = byteArrayToHexString(md.digest());
    } catch (NoSuchAlgorithmException e) {
      e.printStackTrace();
    }
    return resultString;
  }

  public static void main(String[] args) throws Exception {
    System.out.println(MD5("09876543211234567890"));
    System.out.println(MD5("asdasd"));
  }
}

